OEM Carrier Control Transformer 40VA 230/115V for Model 09DE084810

This is the factory OEM replacement control transformer for the Carrier 09DE084810, sourced directly from Carrier/Totaline. The transformer steps down incoming line voltage to the lower control-circuit voltage required to power the thermostat, contactor coils, and safety limit circuits. When this transformer fails, the entire low-voltage control circuit loses power — the thermostat goes blank, the system refuses to start, and no fault codes are produced, making this a common misdiagnosis. If you have confirmed 24V control voltage is absent and the transformer primary is receiving line voltage, this part is the direct fix.

• Specs: 40VA rating | 230V primary input | 115V secondary output | 50/60 Hz | OEM Part Number: HT01BC208 | Cross-references: 320659-301, 2-05757-1
• OEM vs Generic: This is a genuine Carrier/Totaline OEM transformer wound to factory tolerances. Aftermarket units frequently underperform their VA rating under load, causing nuisance tripping of the internal thermal fuse and premature failure.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify input/output voltage post-install). Photograph all wiring connections before disconnecting the old transformer. Wire gauge and terminal orientation must match exactly.
• Warranty: 1-year OEM factory warranty. Orders placed before 3 PM local time ship same business day from our warehouse.

Compatibility: Designed for the Carrier 09DE084810. Always verify the VA rating and primary/secondary voltages printed on your existing transformer's label before ordering — mismatched voltages can damage downstream control components. Our parts specialists are available to confirm fitment before you order.